Music. "Droid Invasion" is the name of an actual track from Episode 1 and "Jedi Temple March" is the name of several videos you can easily look up online that isolate a particular part of a track from Episode 3 (Actually, I'm not even sure if it's included as a track, but it is briefly featured in "The Arena" from Episode 2's soundtrack). If I'm not mistaken, the latter is featured in the scene depicting Vader's attack on the temple. Each selection features a unique Star Wars marching theme.